John d



(1&0 Model.)

J. D. WILK'ENS.-

DENTAL PLUGGER.

Patented Jan. 1, 1889.

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JOHN D. XVILKENS, OF NElV YORK, N. Y.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 395,604, dated January1, 1889.

Application filed July 12, 1888. Serial No. 279,765. (No model.)

To a l] 1071,0710 it may concern.-

Be it known that I, JOHN D. WILKnNs, of the city of New York, in thecounty and State of New York, have invented certain new and usefulImprovements in Engine-Driven Dental lllallets or Plnggcrs; and I dohereby declare that the following is a full and exact descriptionthereof, reference being had to the accon'ipanying drawings, and to theletters of reference marked thereon, making a part of thisspecification, in which- Figure 1 is a centrallongitudinal section of myimproved dental plugger as adjusted to deliver upward or pull blows withthe plugger-point; Fig. 2, a similar section illustrating the pluggerwhen adjusted to deliver downward or thrust blows; and. Fig. 3 is acrosssection in line an of Fig. 1.

The object of my invention is to simplify the construction and operationof enginedriven dental mallets or pluggers, and to provide for thedelivery by the same hammer or plunger of either pull or thrust blows,as desired, by the operator, and for the ready adjustment of the lengthof stroke of the plunger, and consequently of the force of the blow.

It consists in the combination, in a suitable handle,of an adjustablereciprocating plunger-rod, to which the plugger-points or plugging-bitsare attached, an actuating-wheel driven by the engine, a pin upon thewheel engaging at each revolution one of the end walls of a recess inthe side of the rod, an adjusting sleeve or nut fitted upon the rod topartake of its movements, and a controllingpin projecting from thehandle into a recess in the periphery of the sleeve, or vice versa, tolimit the play of the rod, all substantially as herein described andclaimed.

In the accompanying drawings, A represents the handle of the dentalmallet or plugger. It may be of any suitable outward form, and isperforated longitudinally to receive the plunger-rod B, which carriesthe pluggingpoint C, and the perforation is enlarged at the lower end ofthe handle to admit of the free play therein of the upper end of asleeve or nut, D, which is made to screw upon the plunger-rod B, orotherwise fitted thereto to admit of longitudinal adjustment thereon.

The rod is confined in. the handle, and a limited longitudinal playtherein is permitted thereto by means of a screw or pin, E, insertedlaterally through the handle to project into an annular groove or recessencircling the portion of the nut D which inclosed by the handle, theextent of play of the rod being determined by the width of said recess,as shown in Figs. 1 andfl.

Theupper end of the handle A is enlarged to form a cylindrical chamber,F, at a right angle to the length of the handle. This chamber is closedby a cap, G. The upper end of the plunger-rod B projects into thechamber F, the opening through which the rod passes being flattened onone side, as shown in Fig. 3, to engage a counterpart flat face, it, onthe end of the rod, and thereby prevent a rotation of the rod about itsaxis.

A wheel, K, is mounted in the cylindrical chamber F upon a spindle, L,having its bearing in the cap G. This spindle is provided with anencircling conical bearing at O to enter a counterpart seat on the innerface of the cap, and is threaded at its outer end to receive a nut, M,which, screwing thereon, revolves with it. A conical washer, n, fittingin a counterpart conical seat encircling the opening through the cap G,is interposed between the nut and the cap, so that by screwing up thenut the bearing of the spindle between the two conical seats istightened, and all looseness or lostmotion on the spindle due to wear inthe joint may be taken up.

The wheel K is of a diameter to fill the chamber, and is provided withan inwardlyprojecting peripheral flange, P, of suitable width to overlapthe projecting end of the plunger-rod, the position of the chamber Fbeing so adjusted in reference to this end of the plunger-rod as thatthe inner face of the flan ge P of the wheel shall pass in close proX-imity to said end, as shown in Figs. 1 and 2.

A11 actuating-pin, R, is fitted in the flange P to project therefrom farenough to pass through a slot, S, cut transversely in the proximate faceof the end of the plunger-rod. The walls of the slot- S are rounded orbeveled slightly on both edges, and the slot S is of sufficient width tobarely allow the rod to reciprocate to the full extent permitted by itscontrolling-pin E without touching the actuating-pin B when the latteris inclosed by the recess, so that by a longitudinal adjustment of theplunger-rod, produced by turning 5 the nut D, the pin R may be left freeto pass through said slot in the revolution of the wheel K withoutengaging or moving the rod.

By turning the nut D to the right or to the left, however, the upper orthe lower wall of the slot Sin the rod may be brought into position tobe engaged by the pin R as the wheel K revolves, and as the pin comesinto contact with the rounding or beveled faces of either wall it willforce the rod B in that direction.

I 5 Thus at each revolution of the wheel the actuating-pin R is made toimpart an upward or a downward blow to the plunger-rod, and

the force of said blow or the length of the stroke of the rod consequentthereon will be determined by the adjustment of the rod relatively tothe pin as produced by turning the nut D.

The relation of the actuating-pin to the plun ger-rod is positivelymaintained, notwith- 2 5 standing any wear which may occur in thebearings of the spindle carrying said pin, by

means of the adjusting-nut M, which serves to tighten up the bearingsand take up any possible looseness or lost motion in the spin- 0 dle.

The spindle of the wheel K is adapted to be fitted to the flexible shaftT of the dental engine, and the plugging-points (1 C are fitted to theend of the plunger-rod '1 in the 3 5 customary manner. (See Fig. 2.

In the operation of my invention, if a curved I pluggenpoint, C, (seeFig. 1,) .is to be used requiring an upward pull or blow upon thefilling to be condensed, the operator, by turn- 40 ing the nut orsleeve 1) so as to shorten the length of the plunger-rod B within thehandle, will bring the upper wall of the slot S thereon in position tocontact with the re volving pin R on the wheel K as the latter isdriven. by means of its gearing with the engine, so that the pin at eachrevolution will lift the plunger more or less, according to theadjustment thereof, and thereby produce the required movement of theplngger. If, on the other hand, a straight plugger point, C, (see Fig.2,) to be operated by a downward thrust or stroke is needed, the lengthof the plungerrod within its handle is extended by turning the nut D inthe opposite direction, so as to bring the lower wall of the slot S intoposition for engagement with the actuating-pin R. 3y an intermediateadjustment of the length of the rod B its engagei'nent with theactuating-pin may be prevented altogether,

so as to cause a cessation of the movement of the rod without arrestingthe revolution of the wheel K.

The action of the plugging-point as well as its movement is thusdirectly controlled independently ot' the movement of the engine or therevolution of the actuating-wheel by a simple adjustment of the sleeveor nut D.

I claim as my invention 1. The combination, in a dental plugger, ot' thehandle, the plunger-rod playing longitudi 7o nally in said handle andhaving a lateralv transverse slot in its upper end, the sleeve or nutadjustable longitudinally upon said rod, the controlling-pin, and thewheel journaled in the upper end of the handle and carrying anactuating-pin to engage the slotted end of the plunger-rod,substantially in the manner and for the purpose herein set forth.

2. The combination, in a dental plugger, of the handle, thelongitudinally-reciprocating 8o plunger-rod fitted therein, the wheeljournaled in the upper end of the handle and actuating said rod,substantially as set forth, the spindle carrying said wheel having a conical bearing at its inner end within the handle, 8 5 the conical washerencircling the outer end of the spindle to fit in a counterpart seatformed on the outside of the handle, and a nut screwing upon the spindleto bear against said washer, all substantially in the manner and 0 forthe purpose herein set forth.

In testi monywhereof Ihave sign ed my name to this specification in thepresence of two subscribing witnesses.

JOHN D. WILKENS.

\Vitncsses:

A. J ESBERA, E. M. WATSON.

